Damper-operating device.



W. M. DUNN.

DAMPEH OPERATING DEVICE.

APNIC/mou mw Nov. 25` 191s.

1 ,274,25 1. Patented July 30, 1918.

l @Mfg/mm@ UNITED STATES PATENT OFFICE.

WILLIAM M. DUNN, OF SHELBYVILLE, INDIANA, ASSIGNOR OF ONE-HALF TOEMANUEL HENDRICKS, OF SHELBYV]LLE, INDIANA.

DAMPER-OPERATING DEVICE.

Specification of Letters Patent.

Patented July 30, 1918.

To all whom t may concern.'

Be it known that I, l/VILLrAM M. DUNN, a citizen of the United States,residing at Shelbyville, in the county o'tl Shelby and State of Indiana,have invented new and useful Improvements in Damper-Operating Devices,ot' which the following is a specification.

This invention relates to a damper operating device which may beemployed to operate the dempers in lues associated with boilers forgenerating steam and by means of which the current of air passingthrough the fire boX in the boilers tor promoting combustion may becontrolled.

The primary object o't the invention is the provision of a damperoperating device of this character which when applied to a boiler forgenerating steam may be l ad vantageously used to automatically maintainthe steam within the steam chamber of the boiler' at a predeterminedpressure.

Another object ot' the invention is to provide a damper operating deviceot' the class described which is so constructed that when connected witha boiler for generating steam it is operable under the influence ot thesteam in the steam chamber of the boiler to automatically move thedamper in the flue associated with the boiler to a position to decreasethe current of air passing through said flue andthe fire box under theboiler upon the steam in the steam chamber reachingy a predeterminedpressure and upon a reduction of this pressure due to the decrease inthe current of air passing through the re box and flue to again move thedamper in said flue to a position in which the current of air passingtherethrough is increased thus maintaining the steam in the steamchamber of the boiler' at a predetermined pressure and controlling theamount of fuel consumed for this purpose.

Another object of the invention is to provide a damper operatin(r deviceof the class described wherein the damper arranged in the flue of asteam generating device and controlling the current of air through thefire box thereof and said flue is normally held in an inactive positionagainst the influence of a Weight connected therewith by a weightedpiston havin0f connection with said damper and arranged in a steamcylinder connected with the steam chamber of the steam generating devicein such a manner that when the steam in said chamber reaches apredetermined pressure thc piston in said cylinder will be raisedagainst the influence ot the weight thereon and allow the weightconnected with the damper to move the same to an active position.

lVith these and other objects :in view, the invention resides in thenovel combination and arrangement oi parts, which will be hereinafterdescribed and particularly pointed out in the claims.

The preferred embodiment of the invention has been illustrated in theaccompanying drawing, although no restriction is necessarily made to theprecise details of con` struction therein shown, as changes,alterations7 and modifications, within the scope oi the claims may beresorted to when desired.

The ligure in the drawing is a view in elevation partly in section of adamper oper ating device constructed in accordance with the inventionand showing the same applied to a steam generating device, the damper inthe flue associated therewith being shown in its normal or openposition.

Referring now to the drawing in detail, the numeral l designates a steamgenerating device which in this instance has been shown as a tubularboiler having associated therewith the usual flue 2 in which is arrangeda damper 3 for controlling the passage ot a current ot' air through thefire box of said boiler and tlue, said damper having connected therewithan operating arm 4 ar` ranged exteriorly o'l the flue 2 and havingadjustably mounted thereon a weight 5 normally exerting an influenceupon the arm 4t to move the damper 3 within the flue 2 to an inactiveposition or to a position in which a current ot air will be prevented'from passing through the lire box of the boiler and through said flue.

A steam cylinder 6 which is arranged adjacent the boiler l has mountedto slide therein a steam operated piston 7, the stem 8 oi which passesthrough one end of the cylinder and through guides 9 mounted thereon andhas connection with the arm 4L on the damper 3 through the medium of aflexible member 10 terminally connected with the stem 8 and trained overpulleys 1l connected with a suitable support 12 which .Y munication withthe interior of the cylinderV in this instance has been shown as theceiling of the building in which the boiler' is located.

The weight of the piston 7 is equal to the weight 5 on the arm 4, sothat as the piston 7 is moved upwardly in the cylinder 6, the arm 4 iscorrespondingly lowered and as the piston 7 again moves downwardly inthe cylinder 6, the arm 4 is correspondingly raised thus operatingv thedamper 3 and controlling the passage of air through the l fire box andflue 2-of the boiler 1.

An exhaust pipe 13 has connection with the cylinder 6 below the piston 7therein and is provided with a valve 14 for closing the passage therein,said valve beingnormally held in an open position by aweight 15adjustably mounted on an arm 16 pivotally connected with'the pipe 13 andhaving connection with the stem on the valve 14. The valve 14 has formedtherein a bleedv port through which steam within the cylinder 6 may passwhen the valve 14 is in closed position.

A steam supply pipe 1 7 has one end thereof connected with the exhaustpipe 13 between the lower end of the cylinder 6 and the valve 14 and hasits other end connected with the steam chamber in the boiler 1 andprovided with a spring pressed valve 18- for normally closing thepassage through the steam supply pipe 17 but operable by the steamwithin the steam chamber in the boiler 1 upon reaching a predeterminedpressure to open to permit said steam to pass,-

through the supply pipe 17 and into the cylinder 6,'it, of coursebeingunderstood that the pressure of the steam in the pipe 17 is sufficientto counter-balance the weight 15 and close the valve 14.

The steam supply pipe 17 is also'in com.-

6 above the piston 7 through thermedium of a branch pipe 19 terminally:connected with the cylinder and steamy supply pipe 17 and havingarranged therein a check valve 2O serving to prevent the equalization ofsteam pressure upon opposite ,sides of the piston head 7 within thecylinder 6 when steam is admitted to the lower portion of the cylinderthrough the supply pipe 17.

A weight 21 is connected withthe stem 8 of the piston 7 and mounted toslide on the guides 9 upon one end of the cylinder, said weight 21normally serving to counter balance the weight 5 on the arm 4 and holdthev piston 7 in loweredposition inthe cylinder 6 so thaty the damper 3isnormally held in the flue. 2 in an inactive position against theinfluence of the weight 5.

A cut olf valve 22 isarranged in the steam supply pipe 17 Vbetween thevalve 18 andthe steam chamber in the boiler 1.

When the improved damper operating device has beenconnected with a steamgencrating device as shown in the ligure in the drawing, it will be seenthat the weight 21 normally holds the piston 7 in lowered position inthe cylinder 6 so that the damper 3 in the flue 2 is held in an inactiveposition until the steam in the steam chamber of the steam generatingdevice' has reached a predetermined pressure at which time the vvalve 1Sin the steam supply pipe 17 will be opened by the steam in the steamchamber and steam 5 on the arm 4 so that the damper 3 in thef Hue 2 ismoved to a position to decrease the current of air passing through theireI box of the steam generating device and the flue 2 thus controllingcombustion within the fire box and causing a correspondingly decrease ofsteam pressure in the steam cham.- ber of the steam generating device.V

As the steam pressure in the steam chamber of the steam generatingdevice decreases below a predetermined degree the valve 18 closesthe-passage through thesteam supply pipe 17 so that the steam which isconfined in the lower portion of the cylinder 6 gradually escapesthrough the bleed port inthe valve 14 until the steam pressure in thebottom of the cylinder is such that'theweight 15 may move the valve 14to anopen position at which time the weight 21 onthe stem of the pistonwill gradually lower the same in the cylinder 6 as the steam escapesthere-v from and raise the arm 4 until the damper and piston havereached their normal positions.v s v From the foregoing description,taken in connection with the accompanying drawing, it is at onceapparent that a damper controlling devicel hasv been provided which whenapplied to a steam generating device of the class describedwill-regulate the quantity of steam generated thereby and control theconsumption of fuel for this purpose, said device being simple inconstruction, therefore inexpensive Vof manufacture, yet highlyefficient in use.

Having thus described the invention, what is claimed as new, is:

1. In a damper operating'device, in combination, a steamgeneratingdevice having a flue-associated therewith, adamper mounted to turn insaid flue to control thevdraftof airtherethrough, an operating arm onsaid damper arranged exteriorly of said Hue, a

said steam cylinder and having connection with said operating arm, aweight adj ustably mounted on said operating arm to serve as a balanceweight for said piston, a Weight on said piston for normally holding thesame in lowered position within said steam cylinder, a steam. supplypipe having connection with the steam generating device and the interiorof the steam cylinder below said piston, means for controlling theadmission oi" steam from said steam generating deviceto said cylinder toraise the piston thereon against the influence of the weight thereon, asteam exhaust pipe having communication with the interior or' saidcylinder and the steam supply pipe, and a normally open weightcontrolled valve in said steam exhaust pipe to be moved to a closedposition by steam admitted to said cylinder, said valve having a bleedport therein.

2. In a damper operating device, in combination, a steam generatingdevice having a flue associated therewith, a damper mounted to turn insaid flue to control the passage oi the air therethrough, an operatingarm on said damper arranged extcriorly cit' said liuc, a weight adjustably mounted on said operating arm, a steam cylinder, a pistonmounted to slide in said steam cylinder and having connection with saidoperating arm to serve as a balance weight for the weight on theoperating arm, a counter-balance weight on said piston normally holdingthe same in lowered position within said cylinder, a steam supply pipehaving connection with the steam generating device and the interior ofthe steam cylinder below said piston, means for controlling the passageoi steam -from said steam generating device through the supply pipe toraise said piston within said cylinder, a steam exhaust pipe havingconnection with the interior of said cylinder below said piston and thesteam supply ipe, means in said exhaust pipe for contro ling the escapeoitsteam from said supply pipe and the interior oi said cylinder, abranch pipe having connection with the interior ot' said cylinder abovesaid piston and with the steam supply pipe, and a steam operated checkvalve within said branch pipe controlling the passage oi steamtherethrough.

3. In a damper operating device, in combination, a steam generatingdevice having a flue associated therewith, a damper mounted to turn insaid flue to control the passage oi air therethrough, an operating armon said damper arranged exterior-ly of said flue, a, steam cylinder, apiston mounted to slide in said cylinder and having flexible connectionwith said operating arm, a weight on said piston normally holding thesame in lowered position within said cylinder, a steam supply pipehaving connection with the steam generating device and the interior ofthe steam cylinder below said piston, automatic pressure operated meansfor controlling the passage of steam from said steam generating devicethrough the supply pipe to raise said piston within said cylinder, asteam exhaust pipe having connection with the interior of said cylinderat the bottom thereof, a normally open weight controlled valve in saidsteam exhaust pipe to be moved to a closed position by steam admittedtosaid cylinder, said Valve having a bleed port therein, a branch pipehaving connection with said steam supply pipe and communicating with theinterior of said cylinder above said piston, and a steam operated checkvalve within said branch pipe controlling the passage of steamtherethrough.

In testimony whereof I aflix my signature.

VILLIAM M. DUNN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

